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Twelfth Order Corrections to Lepton Anomalies Due to Vacuum Polarization Insertions by Lepton Loops within the Mellin–Barnes Representation melin - barnes表示中轻子环真空极化插入对轻子异常的十二阶修正
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701212
O. P. Solovtsova, V. I. Lashkevich, L. P. Kaptari
{"title":"Twelfth Order Corrections to Lepton Anomalies Due to Vacuum Polarization Insertions by Lepton Loops within the Mellin–Barnes Representation","authors":"O. P. Solovtsova,&nbsp;V. I. Lashkevich,&nbsp;L. P. Kaptari","doi":"10.1134/S1063779626701212","DOIUrl":"10.1134/S1063779626701212","url":null,"abstract":"<p>Explicit analytical expressions are obtained for the electromagnetic corrections to the lepton anomalous magnetic moments <span>({{a}_{L}})</span>(<span>(L = e, mu )</span>, and τ) in the twelfth order of expansion with respect to the electric charge <i>e</i> . The Feynman diagram with insertions of the vacuum polarization operator consisting of five identical lepton loops formed by leptons of type <span>(ell )</span> different from the initial lepton <i>L</i> (<span>(ell )</span> ≠ <i>L</i> ) is considered. The approach is based on the consecutive application of dispersion relations for the vacuum polarization operator and on the Mellin–Barnes transform for the propagators of massive particles. Exact expressions are expanded into a series with respect to the lepton mass ratio <span>(r = {{{{m}_{ell }}} mathord{left/ {vphantom {{{{m}_{ell }}} {{{m}_{L}}}}} right. kern-0em} {{{m}_{L}}}})</span>, and detailed investigation of the asymptotic expressions in the regions of both small (<span>(r to 0)</span>) and large (<span>(r to infty )</span>) values of <i>r</i> is performed. It is shown that for real leptons (electron, muon, and τ lepton), calculations can be performed using simpler approximate formulas with consideration of the number of terms depending on the required accuracy, instead of using exact expressions.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"990 - 996"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Testing Cosmic Ray Generators on ECal/MPD Data 在ECal/MPD数据上测试宇宙射线发生器
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701388
M. A. Martemyanov, V. M. Baryshnikov, S. A. Bulychev, M. Bhattacharjee, Yu. F. Krechetov, V. V. Kulikov, A. A. Kulikovskaya, M. A. Matsiuk, A. Yu. Semenov, I. A. Tyapkin
{"title":"Testing Cosmic Ray Generators on ECal/MPD Data","authors":"M. A. Martemyanov,&nbsp;V. M. Baryshnikov,&nbsp;S. A. Bulychev,&nbsp;M. Bhattacharjee,&nbsp;Yu. F. Krechetov,&nbsp;V. V. Kulikov,&nbsp;A. A. Kulikovskaya,&nbsp;M. A. Matsiuk,&nbsp;A. Yu. Semenov,&nbsp;I. A. Tyapkin","doi":"10.1134/S1063779626701388","DOIUrl":"10.1134/S1063779626701388","url":null,"abstract":"<p><b>Abstract</b>—One of the important subsystems of the MPD experiment is the cylindrical electromagnetic calorimeter ECal, consisting of 50 half-sectors, each of which has 768 cells (towers) of different types and spatial orientations. To calibrate the half-sector towers using cosmic ray muons, a technique was developed that is applicable to its horizontal arrangement. However, in a fully assembled calorimeter, the half-sectors are located on the surface of a horizontal cylinder in different positions relative to the vertical. In this paper, the effect of rotation of half-sector on calibration coefficients is presented for both experimental data and simulations. It is shown that the simulation based on modern parameterizations of the cosmic-ray muon flux is in good agreement with the experimental data. The influence of the angular distribution of the muon flux on the calibration accuracy is discussed.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1083 - 1087"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vector Meson Photoproduction in Ultra-Peripheral Ion–Ion Collisions 超外围离子-离子碰撞中的矢量介子光产生
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701480
S. R. Gevorkyan, O. M. Kouznetsov
{"title":"Vector Meson Photoproduction in Ultra-Peripheral Ion–Ion Collisions","authors":"S. R. Gevorkyan,&nbsp;O. M. Kouznetsov","doi":"10.1134/S1063779626701480","DOIUrl":"10.1134/S1063779626701480","url":null,"abstract":"<p>The strong electromagnetic fields accompaning heavy ions accelerated at BNL and LHC lead to vector meson photoproduction in the ultra-peripheral collisions (UPC), where there is no overlap between the colliding nuclei.We point out the importance of ultra-peripheral photoproduction of vector meson in the Coulomb field of nuclei as a means of measuring the radius of the neutral vector meson due to possibility of two photon exchange. This new contribution to the production amplitude is small compared to the conventional diffractive amplitude, but because of large impact parameters inherent to the ultra-peripheral Coulomb mechanism its impact on the slope in the transfer momenta distribution is substantial. We predict appreciable and strongly energy dependent increase of the slope in the vector meson distribution towards very small momentum transfer.The magnitude of the effect is proportional to the mean radius squared of the vector meson and is within the reach of high precision photoproduction experiments, which gives a unique experimental handle on the size of vector meson.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1137 - 1140"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of Experimental Research Program for Multi-Quark Systems at High pT on Nuclotron 核子上高pT多夸克系统实验研究计划的发展
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701443
G. B. Sharkov, S. S. Shimanskiy, A. V. Stavinskiy
{"title":"Development of Experimental Research Program for Multi-Quark Systems at High pT on Nuclotron","authors":"G. B. Sharkov,&nbsp;S. S. Shimanskiy,&nbsp;A. V. Stavinskiy","doi":"10.1134/S1063779626701443","DOIUrl":"10.1134/S1063779626701443","url":null,"abstract":"<p>The project is aimed at an experimental search and study of the properties of multi-quark (multi-nucleon) states on fixed target experiments with polarized and unpolarized beams of light nuclei of Nuclotron. The unique energy range of the Nuclotron and the high intensity of ions, including polarized ones, combined with the use of cryogenic and polarized targets opens up the possibility of conducting exclusive and correlation studies of rare processes in <i>NN</i>-, <i>dd</i>-, <i>NA</i>-, and <i>AA</i> interactions when particles are produced in the range of <i>p</i><sub>T</sub> &gt; 0.5 GeV/<i>c</i>. The report discusses proposals for studying the properties of diquarks, their flavor and spin states, as well as the formation of 6-quark states in <i>pp</i>, <i>pn</i>, and <i>nn</i> exclusive reactions. Proposals for the experimental search and study of the properties of the cold dense baryonic matter are presented. The studies of the formation of the strange baryons at high baryon densities matter are also being discussed.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1118 - 1123"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DCS for TPC MPD: Integrating DIM and MasterSCADA 4D 用于TPC MPD的DCS：集成DIM和MasterSCADA 4D
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701467
S. M. Sokolova, S. A. Movchan, S. V. Sergeev
{"title":"DCS for TPC MPD: Integrating DIM and MasterSCADA 4D","authors":"S. M. Sokolova,&nbsp;S. A. Movchan,&nbsp;S. V. Sergeev","doi":"10.1134/S1063779626701467","DOIUrl":"10.1134/S1063779626701467","url":null,"abstract":"<p>The detector control system (DCS) of the time projection chamber (TPC) in the NICA/MPD experiment [1] uses DIM (distributed information management system) [2] for fast and reliable data transfer between TPC and MPD DCS. To provide a monitoring, we integrated DIM with the industrial SCADA system—MasterScada 4D [3]. This solution can be applied to other MPD subdetectors.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1130 - 1132"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonperturbative Kinetic Description of the Vacuum QGP Production in the Abelian Projection Method 真空QGP生产的非摄动动力学描述
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701091
V. V. Dmitriev, S. V. Churochkina, V. A. Tseryupa, S. A. Smolyansky
{"title":"Nonperturbative Kinetic Description of the Vacuum QGP Production in the Abelian Projection Method","authors":"V. V. Dmitriev,&nbsp;S. V. Churochkina,&nbsp;V. A. Tseryupa,&nbsp;S. A. Smolyansky","doi":"10.1134/S1063779626701091","DOIUrl":"10.1134/S1063779626701091","url":null,"abstract":"<p>Within the framework of the Abelian projection method in the <span>(SU(N))</span> variant of QCD, a system of nonperturbative selfconsistent equations for the back-reaction problem is derived. This system describes the vacuum production of quarks under the influence of strong quasiclassical gluon fields taking into account violating of the electroneutrality condition.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"926 - 929"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of Methods of Differential Geometry for Analysis of Experimental Data on Multiple Particle Production in Relativistic Nuclear Physics 微分几何方法在相对论核物理中多粒子产生实验数据分析中的应用
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S106377962670139X
A. V. Ponomareva
{"title":"Application of Methods of Differential Geometry for Analysis of Experimental Data on Multiple Particle Production in Relativistic Nuclear Physics","authors":"A. V. Ponomareva","doi":"10.1134/S106377962670139X","DOIUrl":"10.1134/S106377962670139X","url":null,"abstract":"<p>This work examines the features of pion distribution arising in nuclear interactions (<i>n + p</i>) and (<i>p</i> + C) from the standpoint of a geometric approach. Based on the analysis of critical values of the parameter ν, it is shown that the observed peaks can be interpreted as manifestations of the instability of the boundary value problem solution, which in physical terms corresponds to the act of particle creation from the vacuum. A hypothesis is proposed that particle production processes are associated with the emergence of singularities in the hyperbolic state space. This work represents an attempt to unify geometric and physical approaches for describing the mechanisms of pion production and their dependence on the vacuum structure.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1088 - 1093"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electron Identification Using Machine Learning in the MPD Experiment at NICA 在NICA MPD实验中使用机器学习的电子识别
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701431
S. P. Rode
{"title":"Electron Identification Using Machine Learning in the MPD Experiment at NICA","authors":"S. P. Rode","doi":"10.1134/S1063779626701431","DOIUrl":"10.1134/S1063779626701431","url":null,"abstract":"<p>We present studies of electron identification (eID) in the MPD experiment at NICA using machine learning techniques. The goal is to improve electron identification efficiency while preserving high purity, which is crucial for dielectron analyses. We compare electron identification performance between traditional cut-based approach and Machine learning. For machine learning based approach different classifiers, namely, Multi-Layer Perceptron (MLP) and Boosted Decision Tree (BDT) were trained with momentum-integrated and momentum-differential strategies using the CERN ROOT TMVA package.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1112 - 1117"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DD-Pair Production in the Parton Reggeization Approach with Account of Single and Double Parton Scattering 考虑单、双部子散射的部子配准方法中dd对的产生
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701297
L. E. Alimov, V. A. Saleev
{"title":"DD-Pair Production in the Parton Reggeization Approach with Account of Single and Double Parton Scattering","authors":"L. E. Alimov,&nbsp;V. A. Saleev","doi":"10.1134/S1063779626701297","DOIUrl":"10.1134/S1063779626701297","url":null,"abstract":"<p>The paper presents the results of calculations of the cross sections for the production of <span>(DD)</span> pairs at energies of <span>(sqrt s = 7)</span> and 13 TeV within the parton reggeization approach, considering the contributions of both single and double parton scattering. To describe the non-perturbative effects of <span>(c)</span>-quark hadronization into a <span>(D)</span> meson, the fragmentation model with the Peterson fragmentation function is used. The parameter <span>({{sigma }_{{{text{eff}}}}} = 11.5_{{ - 0.5}}^{{ + 0.6}})</span> mb, which determines the contribution of the double parton scattering mechanism, is fixed by comparison with the available experimental data from the LHCb Collaboration for the cross sections of <span>(D)</span>‑meson production at <span>(sqrt s = 7)</span> TeV.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1036 - 1040"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Production of ({{overline Sigma }^{ pm }}) Baryons in p–Pb and pp Collisions at the LHC with ALICE ALICE在大型强子对撞机p-Pb和pp碰撞中产生({{overline Sigma }^{ pm }})重子
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701327
P. Gordeev
{"title":"Production of ({{overline Sigma }^{ pm }}) Baryons in p–Pb and pp Collisions at the LHC with ALICE","authors":"P. Gordeev","doi":"10.1134/S1063779626701327","DOIUrl":"10.1134/S1063779626701327","url":null,"abstract":"<p>This work presents novel measurements of charged <span>(Sigma )</span> hyperons by the ALICE collaboration, with a particular emphasis on a new reconstruction technique for the decay channel <span>({{overline Sigma }^{ pm }} to overline n {{pi }^{ pm }})</span>. The core of our analysis is a pioneering method for detecting anti-neutrons using the photon spectrometer (PHOS). This approach overcomes the significant experimental challenge of reconstructing neutral particles by capitalizing on the characteristic hadronic showers produced by anti-neutrons upon annihilation in the electromagnetic calorimeter. The identification of the accompanying charged pion (<span>({{pi }^{ pm }})</span>) completes the reconstruction of the <span>({{overline Sigma }^{ pm }})</span> decay vertex. We report the transverse momentum (<span>({{p}_{{text{T}}}})</span>) spectra of <span>({{overline Sigma }^{ pm }})</span> hyperons in minimum bias <i>pp</i> and <i>p</i>–Pb collisions at <span>(sqrt {{{s}_{{NN}}}} = 5.02)</span> TeV, the nuclear modification factor <span>({{R}_{{{text{pPb}}}}})</span>, and <span>({{overline Sigma }^{ + }}{kern 1pt} /{kern 1pt} {{overline Sigma }^{ - }})</span> ratios. These results are compared with predictions from state-of-the-art Monte Carlo event generators to test their description of strangeness production.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1051 - 1055"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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